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f shaft, to which is also fastened a slide valve;

UNITED STATES PATENT OEEIOE.

AENEE w. JONES, OE NEw YORK, N. Y.

MEANS FOR PREVENTING THE EXPLOSION OF BOILERS.

Specication of Letters Patent No. 11,567, dated August 22, 1854.

. sure, it will lift the valve, and find entrance to a steam cylinder and push back a piston, said piston being connected with a rock This slide valve is located in another part of the steam-chest, and covers an eXit orifice in such manner that when the piston is pushed back, the slide-'valve is also moved, and the boiler instantly relieved by the escape of its contents into the atmosphere.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and Operation, reference being had to the annexed drawings, in

. escape-pipe; fm, shelf; n,piston; n', pistonrod; 0, stuffing box; p, valve-rod; p', stuffing-box; g, cross head; 1" r, adjusting Screws.

My apparatus is intended to be placed upon the top of the steam boiler, the precise position being immaterial. The steam rises in the direction of arrow, 1, throughthe en- `trance-pipe, b, Ainto the steam-chest, c, and

when the slide valve covers the escape orifice, Z, the steam passes along through the pipe, cZ, into the other steam-chest, e, and passes upward against the spring-valve, g, as seen by arrow, 2,` in Fig. 2. The steam-chest, e, is

divided in the middle by a shelf, m, which being perforated in the middle, a seat is formed for a spring-valve, g.` This valve is` kept in its place by means of a spring (f) pressure.

which is adjusted to any desired degree of pressure, by means of the cross-head (g) and adjusting screws (1 r) as shown in Fig. (2). The steam from the boiler is always pressing up against the valve, g, but it cannot lift the same until the pressure comes to be greater than that to which the'spring-valve, g, had been previously gauged to resist. The instant the pressure in the boiler exceeds the resistance of the spring-valve, g, the latter lifts, and the steam rushing up enters pipe, la, which opens into one end of a steam-cyl inder, c', and pushes back the `piston Arrow 3 in Fig. 2, shows the direction of the steam after passing the valve, g. The pistonrod, is attached to a rock-shaft j; s0 that when the piston is pushed back, the rock-shaft is also correspondingly moved. The slide-valve, Ze, is also attached by means of its rod, Z9, to the rock-shaft, and moves with thelatter. In Fig. 2, `the Slide-valve, Zc, is Seen covering the escape-pipe, Z. In Fig. 3, the rock-shaft has been thrown back in the manner before described, and the Slide-valve, 7c, has, also, been drawn back, leaving the escape pipe, Z, open, and permitting the free exit of the steam into the atmosphere. j The slide-valve, 7c, and the escape pipe, Z, are made quite large in order to permit the easy escape of the steam, and relieve the boiler, instantly, from an undue In this manner all liability to eX- plosion, in the boiler, is done away with, and life and property rendered perfectlysafe, wherever steam is used.

, Iam aware that contrivances have been made by which the valve which is raised by the pressure of Steam is made to open another valve for its escape from the boiler and I therefore do not claim to have been the first to have made such a discovery. I only ask a patent which Shall cover my particular devices and their combination.

What I claim is- The combination of the rocloshaft, j, with the slide-valve, lc, piston, n, spring-valve, g,' and steam-chests, c, c, in the manner and for the purposes herein described.

ABNER W. JONES.

. Witnesses:

A. E. BEACH, ABNER JONES. 

